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Colligative Properties - Freezing Point Depression

The physical properties of solutions that are affected by the dissolved solute particles are called colligative properties of solutions. As solvents begin to freeze the solutes interfere with the attractive forces among the solvent particles and prevent them from entering its solid state at the normal freezing point. Instead, the freezing point of a solution is always lower than that of a pure solvent. In this lab, students test the effect of a sugar solute on a water solvent.

Pictures courtesy of Zack Lee.

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